MRE Zeolite Catalyst for Low-Temperature C22+ Hydro-Isomerization
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Solution Overview
Problem
Existing zeolite catalysts are ineffective for hydro-isomerization of hydrocarbons with 22 or more carbon atoms due to long carbon chain lengths, leading to cracking and requiring higher reaction temperatures.
Innovation Solution
A zeolite catalyst with an MRE structure, characterized by an adsorption ratio of lutidine to collidine of 3 to 10, silica-alumina ratio of 100 to 250, and absence of macropores and mesopores, which locates acid sites near the pore mouth, enhancing hydro-isomerization yield and reducing cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional zeolite catalysts are used for hydro-isomerization of C22+ hydrocarbons, then the reaction can proceed, but the long carbon chain length prevents effective access to acid sites, leading to low conversion and requiring higher reaction temperatures
Solution Approach 1:
The patent applies local quality by creating a specific zeolite structure (MRE type) where acid sites are concentrated near the pore mouth rather than uniformly distributed throughout the crystal. This localized arrangement of catalytic sites allows long-chain C22+ hydrocarbons to access the acid sites more easily at the pore entrance, enabling effective hydro-isomerization without requiring the hydrocarbons to penetrate deep into the zeolite crystal, thereby reducing cracking reactions that occur when chains become trapped inside pores
Solution Approach 2:
The patent utilizes the porous structure of MRE-type zeolite with specific pore dimensions and architecture that facilitate the diffusion of long-chain hydrocarbons. The pore structure is designed to allow C22+ molecules to reach the acid sites near the pore mouth while preventing them from becoming trapped deep within the crystal, thus enabling selective isomerization over cracking
2Productivity
If higher reaction temperatures are used to improve hydro-isomerization activity, then conversion increases, but cracking reactions are promoted and product quality deteriorates
Solution Approach 1:
The patent changes the structural parameters of the zeolite catalyst by selecting MRE-type zeolite with specific silica-alumina ratios and acid site distributions. This structural modification allows the reaction to proceed at lower temperatures with high selectivity for isomerization, avoiding the temperature conditions that promote cracking reactions
3Device complexity
If zeolite catalysts with uniform acid site distribution are used, then the catalyst structure is simple, but long-chain hydrocarbons cannot effectively reach the acid sites inside the pores
Solution Approach 1:
The patent implements local quality by creating a non-uniform distribution of acid sites within the zeolite crystal, specifically concentrating them near the pore mouth. This localized arrangement solves the accessibility problem for long-chain hydrocarbons while maintaining a relatively simple overall zeolite crystal structure, achieving both structural simplicity and high catalytic activity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The zeolite catalyst achieves high hydro-isomerization yield of C22+ hydrocarbons at lower reaction temperatures, minimizing cracking and improving lubricating base oil quality.
Implementation Method 1
the zeolite catalyst may have an adsorption amount ratio of lutidine to collidine of greater than 3 and less than or equal to 10 as measured by Fourier-transform infrared spectroscopy (FTIR) using lutidine and collidine as adsorbents
Implementation Method 2
The above-described hydro-isomerization reaction is known to be performed mainly by a bi-functional catalyst, which typically includes a metal component with a hydrogenation/dehydrogenation function and a support with acid sites for skeletal isomerization
Data Source
AI summary
According to an aspect of the present invention, provided is a zeolite catalyst having an MRE structure for hydro-isomerization. The zeolite catalyst has an adsorption volume ratio of lutidine to collidine measured by Fourier-transform infrared spectroscopy (FTIR) using lutidine and collidine as adsorbents of greater than 3 and less than or equal to 10. According to an aspect of the present invention, provided is a method of hydro-isomerization for a hydrocarbon feedstock, including subjecting the hydrocarbon feedstock to a hydro-isomerization reaction under conditions of a temperature of 200° C. to 500° C., a hydrogen pressure of 1 to 200 atmospheres, a liquid space velocity (LHSV) of 1.0 to 10.0 hr−1, and the hydrogen/feedstock ratio of 45 to 1780 Nm3/m3 in the presence of the zeolite catalyst.